JP6409245B2 - Storage tank - Google Patents

Description

  The present invention relates to a storage tank that stores fluid such as liquid and gas and has a floating roof.

  In a storage tank for storing fluids such as various liquids and gases, a floating roof is provided for storing the fluid in a bottomed cylindrical tank body extending in the vertical direction and covering the fluid stored in the tank body from above. There is something. In such a storage tank, the floating roof moves up and down in the tank body following changes in the fluid due to an increase or decrease in the amount of stored fluid.

  In a storage tank equipped with such a floating roof, if a gap is generated between the outer peripheral part of the floating roof and the inner peripheral surface of the tank body due to a large earthquake or the like, the fluid stored in the tank body leaks out. There is.

  Therefore, in Patent Document 1, the floating roof is constituted by a disk-shaped hollow bag-like outer skin and a reinforcing body provided in the outer skin, and the outer skin is inflated by filling the outer skin with gas, thereby floating the roof. The structure which suppresses that a clearance gap produces between the outer peripheral part of a roof and the internal peripheral surface of a tank main body is disclosed.

  Further, in Patent Document 2, an annular seal material is provided on the outer periphery of the floating roof in plan view, and an expansion that occurs when swinging due to an earthquake is detected between the seal material and the outer periphery of the floating roof. The structure provided with the expansion-contraction bag for pressure is disclosed. In such a configuration, the space between the outer peripheral portion of the floating roof and the inner peripheral surface of the tank body is normally closed by a sealing material provided on the outer peripheral portion of the floating roof. When swinging due to an earthquake is detected, the expansion bag for pressurization expands to press the sealing material against the inner peripheral surface of the tank body, and there is a gap between the outer peripheral portion of the floating roof and the inner peripheral surface of the tank main body. Suppresses the occurrence.

JP 2005-178900 A JP 60-148488 A

However, in the configuration disclosed in Patent Document 1, when the floating roof is displaced such that the outer skin of the expanded floating roof is separated from the inner peripheral surface of the tank body during an earthquake or the like, Fluid leaks from between the inner peripheral surface of the tank body.
On the other hand, even when the floating roof is greatly displaced, the outer periphery of the floating roof is not in contact with the inner peripheral surface of the tank body so that no gap is generated between the outer periphery of the floating roof and the inner peripheral surface of the tank body. It is conceivable to press strongly. However, this increases the frictional force between the outer peripheral portion of the floating roof and the inner peripheral surface of the tank body. Then, the floating roof becomes difficult to displace following the change of the fluid in the tank body.

On the other hand, in the configuration disclosed in Patent Document 2, when the elastic bag for pressurization is inflated when the swing due to the earthquake is detected, the space between the outer peripheral portion of the floating roof and the inner peripheral surface of the tank main body is increased. Generation of a gap can be suppressed. Moreover, since the pressurizing elastic bag is shrunk under normal conditions, the frictional force between the outer peripheral portion of the floating roof and the inner peripheral surface of the tank body is not excessively increased, and the displacement of the floating roof is hindered. Can be suppressed.
However, in such a configuration, it is necessary to provide a pressurizing elastic bag between the sealing material and the outer peripheral portion of the floating roof. Therefore, even if an extension storage bag is additionally installed in an existing storage tank to achieve the configuration disclosed in Patent Document 2, after the sealing material is removed from the floating roof, the space between the sealing material and the floating roof It is necessary to attach an expansion / contraction bag for pressurization and to attach a sealing material again. Therefore, it is difficult to additionally install an expansion / contraction bag for pressurization between the sealing material and the outer peripheral portion of the floating roof with respect to the existing storage tank.

  The purpose of the present invention made there is to prevent the fluid from leaking through the gap between the floating roof and the tank body in the event of an earthquake, while preventing the floating roof from operating normally. It is to provide a storage tank that can be easily added to the tank.

The present invention employs the following means in order to solve the above problems.
The storage tank according to the present invention includes a tank main body having a bottomed cylindrical shape extending in the vertical direction, a floating roof that covers fluid stored in the tank main body from above, an outer edge portion of the floating roof, and the tank main body Between the inner peripheral surface of the tank main body and slidable in the vertical direction with respect to the inner peripheral surface of the tank body, and the sliding body toward the inner peripheral surface side of the tank main body. A primary seal portion that seals between the outer edge portion and the inner peripheral surface, and a lower portion of the primary seal portion, and is provided on the inner peripheral surface of the tank body. The seal member that seals between the outer edge portion and the inner peripheral surface by contact, and the seal member only when the distance from the outer edge portion of the floating roof in the sliding body exceeds a threshold value Provided with a drive unit that contacts the inner surface of the tank body It comprises a secondary sealing portion has a.

According to such a configuration, the storage tank is urged toward the inner peripheral surface side of the tank body by the urging member in the primary seal portion, so that the outer edge of the floating roof and the tank body are A gap between the inner peripheral surface and the inner peripheral surface is sealed to prevent leakage of fluid stored in the tank body. Further, when the floating roof moves up and down in the tank body due to increase or decrease of fluid or the like, the sealing body is maintained by sliding along the inner peripheral surface of the tank body.
In addition, the outer edge of the floating roof may be displaced in the direction in which the outer edge of the floating roof contacts or separates from the inner peripheral surface of the tank body during an earthquake or the like. Thereby, with the displacement of the floating roof, the separation distance of the sliding body biased by the biasing member from the outer edge of the floating roof varies. If the earthquake is strong, the sliding body may be separated from the inner peripheral surface of the tank body. Then, when the separation distance from the outer edge part of the floating body of a sliding body exceeds the preset threshold value, a sealing member is made to contact the internal peripheral surface of a tank main body by a drive part. As a result, the space between the outer edge of the floating roof and the inner peripheral surface of the tank body is sealed by the seal member of the secondary seal portion, and the fluid in the tank body can be prevented from leaking.
This secondary seal portion brings the seal member into contact with the inner peripheral surface of the tank body only when the distance from the outer edge of the floating roof in the sliding body exceeds a threshold value. Therefore, in a normal time when a strong earthquake or the like does not occur, the space between the outer edge portion of the floating roof and the inner peripheral surface of the tank body is sealed only by the primary seal portion. Thereby, in the normal time, the vertical movement in the tank body of the floating roof is not hindered by the frictional force in the secondary seal portion.
Further, since the secondary seal portion is provided below the primary seal portion, even when the secondary seal portion is additionally provided with respect to the existing storage tank, the secondary seal portion is provided between the primary seal portion and the floating roof. There is no need to provide a secondary seal.

Further, in the storage tank according to the present invention, in the storage tank, a plurality of the seal members are provided along a circumferential direction of the tank body, and the drive unit is at least a part of the tank body in the circumferential direction. When the distance from the outer edge portion of the floating roof in the sliding body exceeds a threshold value, the seal member provided at a portion exceeding the threshold value is brought into contact with the inner peripheral surface of the tank body. It may be.
By configuring in this way, when the sliding body is about to be separated from the inner peripheral surface of the tank main body at any part in the circumferential direction of the tank main body, the seal member is attached to the inner peripheral surface of the tank main body at that part. By making contact, the space between the outer edge of the floating roof and the inner peripheral surface of the tank body is quickly sealed.

In the storage tank according to the present invention, in the storage tank, a plurality of the urging portions are provided along a circumferential direction of the tank body, and each of the urging portions is provided with a weight member at one end. The sliding body is connected to the other end, and is constituted by a counterweight that swings according to the displacement of the sliding body in the direction of contact with and away from the inner peripheral surface side of the tank body. The seal member may be brought into contact with the inner peripheral surface of the tank body according to the swing of the weight.
In such a configuration, the counterweight urges the sliding body toward the inner peripheral surface of the tank body by the load of the weight member. When the sliding body is displaced in a direction in which the sliding body comes into contact with or separates from the inner peripheral surface of the tank body when an earthquake occurs, the counterweight swings in conjunction with it. In the drive unit, the seal member can be brought into contact with the inner peripheral surface of the tank body when the distance from the outer edge portion of the floating roof in the sliding body exceeds the threshold in accordance with the swing of the counterweight.
Here, for example, when the displacement of the floating roof is detected by an accelerometer or the like, it is difficult to specify at which part in the circumferential direction of the tank the sliding body is separated from the inner peripheral surface of the tank body. On the other hand, by using counterweights provided at a plurality of locations in the circumferential direction as in the above configuration, when the sliding body is about to move away from the inner peripheral surface of the tank body, the counterweight at that portion swings. Since the sealing member is brought into contact with the inner peripheral surface of the tank main body, the space between the outer edge of the floating roof and the inner peripheral surface of the tank main body can be reliably sealed.

Further, in the storage tank according to the present invention, in the storage tank, the drive unit has a separation distance from the outer edge portion of the floating roof in the sliding body that exceeds a threshold in response to the swing of the counterweight. A switch may be provided that causes the seal member to contact the inner peripheral surface of the tank body when detecting the above.
With this configuration, when the switch detects that the distance from the outer edge of the floating roof in the sliding body exceeds the threshold, the seal member can be reliably brought into contact with the inner peripheral surface of the tank body. it can.

Further, in the storage tank according to the present invention, in the storage tank, when the distance between the driving unit and the outer edge of the floating roof in the sliding body exceeds a threshold value, the counterweight swings. A seal member drive mechanism for bringing the seal member into contact with the inner peripheral surface of the tank main body may be provided in conjunction with.
With this configuration, when the distance from the outer edge of the floating roof in the sliding body exceeds the threshold, the sealing member is driven by the mechanical operation of the sealing member driving mechanism that is interlocked by the swinging operation of the counterweight. Can be reliably brought into contact with the inner peripheral surface of the tank body.
In such a configuration, since it is not necessary to use electrical wiring or the like, the storage tank does not need to be explosion-proof, and cost can be reduced.

Further, the storage tank according to the present invention is the above storage tank, wherein the secondary seal portion is provided at the outer edge portion of the floating roof and has flexibility and a bag as the seal member formed hollow. The bag is inflated and brought into contact with the inner peripheral surface of the tank body, and the cylinder containing the filler to be filled in the bag and the supply of the filler from the cylinder to the bag are interrupted. An opening / closing valve, and the driving unit may open the opening / closing valve to fill the bag with the filler and inflate it, and to contact the inner peripheral surface of the tank body.
By comprising in this way, when the separation distance from the outer edge part of the floating roof in a sliding body exceeds a threshold value, a drive part opens an on-off valve. Then, the bag is filled with the filler from the cylinder and the bag is inflated, and comes into contact with the inner peripheral surface of the tank body. Accordingly, the bag functions as a seal member, and the space between the outer edge of the floating roof and the inner peripheral surface of the tank body can be sealed.

Further, in the storage tank according to the present invention, in the storage tank, the secondary seal portion faces a holder provided at the outer edge portion of the floating roof and the holder toward the inner peripheral surface of the tank body. An elastic member as the seal member held movably, a biasing member for biasing the elastic member toward the inner peripheral surface of the tank body, and the inner periphery of the tank body of the elastic member A stopper that restricts movement toward the surface side, and the drive unit releases the restriction of movement of the elastic member by the stopper to bring the elastic member into contact with the inner peripheral surface of the tank body. Also good.
By comprising in this way, when the separation distance from the outer edge part of the floating roof in a sliding body exceeds a threshold value, a drive part cancels | releases control of the movement of the seal member by a stopper. Then, the seal member urged by the urging member moves toward the inner peripheral surface of the tank body. By this seal member coming into contact with the inner peripheral surface of the tank main body, it is possible to seal between the outer edge of the floating roof and the inner peripheral surface of the tank main body.

  According to the storage tank according to the present invention, it is possible to reliably prevent fluid from leaking from the gap between the floating roof and the tank body in the event of an earthquake, while preventing the floating roof from being hindered during normal operation. It can be easily added to the storage tank.

It is an elevation sectional view showing the whole storage tank composition concerning a 1st embodiment of this invention. It is sectional drawing which shows the structure of the seal | sticker part provided between the outer edge part of a floating roof, and the internal peripheral surface of a tank main body. It is sectional drawing which shows the state of a seal | sticker part when a floating roof main body displaces to radial direction within a tank main body by an earthquake etc. It is sectional drawing which shows the state of a secondary seal part when a floating roof main body is displaced to radial direction within a tank main body by an earthquake etc., and the sliding body of a primary seal part leaves | separated from the internal peripheral surface of a tank main body. It is a top view which shows the structure of the bag which comprises a secondary seal part in the storage tank in 2nd Embodiment. It is sectional drawing which shows the structure of a seal part in the storage tank in 3rd Embodiment. In the seal part in 3rd Embodiment, it is sectional drawing which shows the state of a secondary seal part when the sliding body of a primary seal part leaves | separated from the internal peripheral surface of a tank main body. It is sectional drawing which shows the structure of a seal part in the storage tank in 4th Embodiment. In the seal part in 4th Embodiment, it is sectional drawing which shows the state of a secondary seal part when the sliding body of a primary seal part leaves | separated from the internal peripheral surface of a tank main body. It is sectional drawing which shows the structure of a seal part in the storage tank in 5th Embodiment. In the seal part in 5th Embodiment, it is sectional drawing which shows the state of a secondary seal part when the sliding body of a primary seal part leaves | separated from the internal peripheral surface of a tank main body.

  Hereinafter, with reference to an accompanying drawing, a form for carrying out a storage tank by the present invention is explained. However, the present invention is not limited only to these embodiments.

(First embodiment)
FIG. 1 is an elevational sectional view showing the overall configuration of the storage tank according to the first embodiment of the present invention.
As shown in FIG. 1, the storage tank 10 includes a tank body 11 and a floating roof 20.

  The tank body 11 is, for example, circular in plan view, extends upward from a bottom plate portion 13 provided on the ground G, and opens upward, and a roof portion 15 that closes the upper portion of the cylindrical wall 14. And. In this manner, the tank body 11 has a bottomed cylindrical shape extending in the vertical direction. The tank body 11 has a storage space 11S in which various stored fluids (fluids) 100 in a gas state or a liquid state are stored.

A pipe 16 through which the stored fluid 100 is taken in and out of the storage space 11 </ b> S is connected to the lower portion of the tank body 11.
In addition, a lift device 17 for raising and lowering the floating roof 20 as necessary is provided on the lower surface of the roof portion 15.
Further, an upper part of the tank body 11 is provided with a ventilation tower 18 that ventilates the accommodation space 11S, and an explosion-proof gas diffusion pipe 19 that diffuses outside the tank body 11 when the contained fluid 100 reaches a predetermined pressure or higher. And are provided.
Further, the tank body 11 includes a seal liquid circulation section (not shown) that circulates a seal liquid L described later from the lower portion of the tank body 11 to the primary seal section 30 (see FIG. 2).

  The floating roof 20 is provided in the tank main body 11 so as to cover the stored fluid 100 stored in the tank main body 11 from above. The floating roof 20 pressurizes the contained fluid 100 by applying a load to the contained fluid 100 in the tank body 11 by its own weight. Further, the floating roof 20 moves up and down following the increase and decrease of the accommodated fluid 100 in the tank body 11.

FIG. 2 is a cross-sectional view showing a configuration of a seal portion provided between the outer edge portion of the floating roof and the inner peripheral surface of the tank body.
As shown in FIGS. 1 and 2, the floating roof 20 includes a floating roof main body 21, a weight portion 22, and a seal portion 23.
The floating roof body 21 has a dome shape that bulges upward. In addition, the shape of the floating roof main body 21 is not limited to a dome shape, and may be a flat plate shape. Such a floating roof body 21 is formed with an outer diameter smaller than the inner diameter of the cylindrical wall 14 of the tank body 11 by a predetermined dimension.

  As shown in FIG. 2, the weight portion 22 has an annular shape in plan view, and is provided integrally with the outer edge portion 21 s of the floating roof body 21. The weight portion 22 is made of, for example, concrete and has a weight set so that a predetermined load can be applied to the contained fluid 100 by the floating roof 20.

  On the outer edge portion 21 s of the floating roof main body 21, a support column 27 extending upward is provided. The support 27 is provided with a guide roller 28 that abuts against the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11. Thus, when the floating roof 20 moves up and down in the tank body 11, the guide roller 28 rotates along the inner peripheral surface 14 a of the cylindrical wall 14, thereby smoothly guiding the vertical movement of the floating roof 20. To do.

The seal part 23 includes a primary seal part 30 and a secondary seal part 50A.
The primary seal portion 30 faces the inner peripheral surface 14 a of the cylindrical wall 14 positioned radially outward with respect to the sliding body 31 provided on the outer peripheral surface of the weight portion 22 and the outer edge portion 21 s of the floating roof body 21. And an urging portion 32 for urging the sliding body 31 and a sealing liquid L.

  The sliding body 31 is supported by a base plate 33 that is disposed so as to face the inner peripheral surface 14a of the cylindrical wall 14 and is positioned in the vertical plane. The base plate 33 is suspended via a rod 36 from a stay 35 that extends radially outward from the outer edge portion 21 s of the floating roof body 21.

The sliding body 31 is made of, for example, a rubber-based material, extends from the base plate 33 toward the inner peripheral surface 14a of the cylindrical wall 14, and has a tip end slidably provided on the inner peripheral surface 14a of the cylindrical wall 14. ing. In this embodiment, the sliding body 31 is provided on the base plate 33 as a pair with a space in the vertical direction.
The sliding body 31 and the base plate 33 that supports the sliding body 31 are continuous along the circumferential direction of the tank body 11 and have an arc shape (annular shape) when viewed in plan.

Further, a film body 37 made of canvas or the like having oil resistance and flexibility is provided between the lower end portion of the base plate 33 and the outer peripheral surface 22 s of the weight portion 22.
The sliding body 31 and the film body 37 block the space between the weight portion 22 provided on the outer edge portion 21 s of the floating roof body 21 and the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11.

  The urging unit 32 includes a link mechanism 38 that allows the sliding body 31 supported by the base plate 33 to move in a direction in which the sliding body 31 is in contact with and away from the inner peripheral surface 14 a along the radial direction of the cylindrical wall 14. Counter weight 39 to be operated.

  The link mechanism 38 is provided between the base plate 33 and the outer peripheral surface 22 s of the weight portion 22. The link mechanism 38 includes a bracket 38 a fixed to the outer peripheral surface 22 s of the weight portion 22, and a link plate provided on the bracket 38 a via a pin 38 b so as to be rotatable in a vertical plane including the radial direction of the cylindrical wall 14. 38c and a link arm 38e rotatably connected to the link plate 38c via a pin 38d. The link arm 38e is rotatably connected to the base plate 33 via a pin 38f.

  The counterweight 39 is provided on the outer edge portion 21 s of the floating roof body 21. The counterweight 39 includes a bracket 39a fixed on the weight portion 22, a weight rod 39c provided on the bracket 39a via a pin 39b so as to be rotatable in a vertical plane including the radial direction of the cylindrical wall 14, A weight member 39d provided at the radially inner end of the cylindrical wall 14 in the weight rod 39c. In the weight rod 39c, the radially outer end of the cylindrical wall 14 and the link plate 38c of the link mechanism 38 are connected via a connecting wire 39e.

  A plurality of such urging portions 32 are provided at intervals in the circumferential direction of the cylindrical wall 14 of the tank body 11. Each urging portion 32 applies a force F in the direction of pulling up the connecting wire 39e to the link plate 38c by the load of the weight member 39d of the counterweight 39. Accordingly, the link plate 38c presses the base plate 33 toward the inner peripheral surface 14a of the cylindrical wall 14 via the link arm 38e. As a result, the urging portion 32 has the tip of the sliding body 31 supported by the base plate 33 pressed against the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11. The sealing property between the peripheral surface 14a is ensured.

  The sealing liquid L is stored in a space between the weight portion 22 and the inner peripheral surface 14 a of the cylindrical wall 14 that is closed by the sliding body 31 and the film body 37. The seal liquid L is made of, for example, oil. With this sealing liquid L, a sealing property between the outer edge portion 21 s of the floating roof body 21 and the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11 is ensured.

  The secondary seal portion 50 </ b> A is provided below the primary seal portion 30. The secondary seal portion 50A includes a hollow bag-like bag (seal member) 51A having flexibility such as rubber, and a cylinder 52 filled with a filler such as an inert gas such as nitrogen injected into the bag 51A. A connecting pipe 53 that connects the bag 51A and the cylinder 52; an on-off valve 54A provided on the connecting pipe 53; and a drive unit 55A that opens and closes the on-off valve 54A.

The bag 51A is suspended from the base plate 33 of the primary seal portion 30 via a suspension film 56 made of a flexible material such as an oil-resistant canvas. The suspension film 56 is formed in a belt shape that is continuous in the circumferential direction along the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11.
In this embodiment, the bag 51 </ b> A has an annular tube shape that is continuous in the circumferential direction of the cylindrical wall 14 of the tank body 11.

The cylinder 52 is fixed to the lower surface of the weight portion 22 via a bracket 57.
In this embodiment, the on-off valve 54A is an electromagnetic valve that opens and closes by an electrical signal.

The drive unit 55A includes a switch 58 provided on the weight unit 22, and a wiring 59 that electrically connects the switch 58 and the on-off valve 54A.
The switch 58 is disposed below the weight member 39 d of the counterweight 39 of the primary seal portion 30. When the weight rod 39c of the counterweight 39 swings and the weight member 39d descends and comes into contact with the switch 58, the switch 58 is switched between the ON state and the OFF state. The switch 58 outputs a predetermined electrical signal when switched between the ON state and the OFF state. The electrical signal output from the switch 58 is transmitted to the on-off valve 54A via the wiring 59. The on-off valve 54A is switched between an open state and a closed state in accordance with the electrical signal transmitted from the switch 58.

  A plurality of sets of the cylinder 52, the connection pipe 53, the on-off valve 54 </ b> A, and the drive unit 55 </ b> A are provided at intervals along the circumferential direction of the cylindrical wall 14 of the tank body 11.

  In such a secondary seal portion 50A, the bag 51A is normally not filled with a filler and is deflated, and is not in contact with the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11. Yes.

FIG. 3 is a cross-sectional view showing a state of the seal portion when the floating roof body is displaced in the radial direction in the tank body due to an earthquake or the like. FIG. 4 is a cross-sectional view showing a state of the secondary seal portion when the floating roof body is displaced radially in the tank body due to an earthquake or the like, and the sliding body of the primary seal portion is separated from the inner peripheral surface of the tank body. It is.
As shown in FIG. 3, when the floating roof body 21 is displaced in the radial direction in the tank body 11 due to an earthquake or the like, the sliding body 31 that abuts against the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11 is The tank body 11 is relatively displaced in a direction in which it contacts and separates from the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11. When the outer edge portion 21s of the floating roof main body 21 is displaced in the direction away from the inner peripheral surface 14a of the cylindrical wall 14, the sliding body 31 urged by the weight member 39d of the counterweight 39 of the urging portion 32 is cylindrical. The wall 14 is displaced toward the inner peripheral surface 14a.

At this time, when the seismic intensity of the earthquake is strong, as shown in FIG. 4, the sliding body 31 may reach the upper limit of the moving stroke by the link mechanism 38 and be separated from the inner peripheral surface 14 a of the cylindrical wall 14. is there.
As shown in FIG. 3, the valve drive unit 55 </ b> A is configured so that the sliding body 31 reaches the limit of the moving stroke by the link mechanism 38 and separates from the inner peripheral surface 14 a of the cylindrical wall 14. When the separation distance of the sliding body 31 from the outer edge portion 21s exceeds a preset threshold value D, the weight rod 39c of the counterweight 39 comes into contact with the switch 58.
When the weight rod 39c comes into contact with the switch 58 and the switch 58 is switched, the on-off valve 54A is opened, the filling body is filled from the cylinder 52 through the connection pipe 53, and the bag 51A is inflated.
Here, in this embodiment, the drive unit 55A is provided with a plurality of sets at intervals along the circumferential direction of the cylindrical wall 14 of the tank main body 11, but of the plurality of sets of the drive units 55A. When at least one of the switches 58 is switched, it is preferable that all the on-off valves 54A are opened to inflate the entire circumference of the bag 51A.

  When the bag 51A is inflated in this manner, as shown in FIG. 4, even if the sliding body 31 is separated from the inner peripheral surface 14a of the cylindrical wall 14, the inflated bag 51A remains on the cylindrical wall 14 of the tank body 11. It is in close contact with the inner peripheral surface 14a. At this time, the space between the bag 51A and the base plate 33 is closed by the suspension film 56. In addition, a closed state is maintained between the base plate 33 and the weight portion 22 of the outer edge portion 21 s of the floating roof body 21 by the film body 37 of the primary seal portion 30. Thereby, the sealing liquid L stays above the bag 51 </ b> A, the suspension film 56, and the film body 37.

  Thus, even if the floating roof body 21 is displaced due to an earthquake or the like and the sliding body 31 of the primary seal portion 30 is separated from the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11, the bag of the secondary seal portion 50A. When 51A expands, the closed state between the outer edge portion 21s of the floating roof body 21 and the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11 is maintained.

  In addition, after the earthquake or the like has subsided, the secondary seal 50A can be reused by removing the filler from the bag 51A and constricting the bag 51A.

According to the storage tank 10 as described above, the storage tank 10 is urged toward the inner peripheral surface 14 a side of the tank body 11 by the urging portion 32 in the primary seal portion 30. The space between the outer edge portion 21s of the floating roof 20 and the inner peripheral surface 14a of the tank body 11 is sealed to prevent the contained fluid 100 stored in the tank body 11 from leaking. Further, when the floating roof 20 moves up and down in the tank body 11 due to increase / decrease of the contained fluid 100 or the like, the sliding body 31 slides along the inner peripheral surface 14 a of the tank body 11 to maintain the sealed state.
Further, if the earthquake is strong, the sliding body 31 may be separated from the inner peripheral surface 14 a of the tank body 11. Therefore, when the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds a preset threshold value D, the bag 51A is brought into contact with the inner peripheral surface 14a of the tank body 11 by the driving portion 55A. Thus, the bag 51A of the secondary seal portion 50A seals between the outer edge portion 21s of the floating roof 20 and the inner peripheral surface 14a of the tank body 11, and prevents the contained fluid 100 in the tank body 11 from leaking. Can do.

  The secondary seal portion 50 </ b> A brings the bag 51 </ b> A into contact with the inner peripheral surface 14 a of the tank body 11 only when the distance from the outer edge portion 21 s of the floating roof 20 in the sliding body 31 exceeds the threshold D. Therefore, in a normal time when a strong earthquake or the like does not occur, the space between the outer edge portion 21s of the floating roof 20 and the inner peripheral surface 14a of the tank body 11 is sealed only by the primary seal portion 30. Thereby, at the normal time, the vertical movement of the floating roof 20 in the tank body 11 is not hindered by the frictional force in the secondary seal portion 50A.

  Furthermore, since the secondary seal portion 50A is provided below the primary seal portion 30, even when the secondary seal portion 50A is additionally provided to the existing storage tank 10, the primary seal portion 30 and There is no need to provide the secondary seal portion 50 </ b> A with the floating roof 20.

  Therefore, it is possible to reliably prevent the contained fluid 100 from leaking from the gap between the floating roof 20 and the tank body 11 in the event of an earthquake or the like while suppressing the hindrance of the operation of the floating roof 20 at normal times. It becomes possible to easily add to.

  In addition, when the sliding body 31 of the primary seal portion 30 is in contact with the inner peripheral surface 14a of the tank body 11, the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds the threshold value D. Thus, the transition from the sealed state by the primary seal portion 30 to the sealed state by the secondary seal portion 50A can be made without interruption. Therefore, even when a strong earthquake or the like occurs, the space between the outer edge portion 21s of the floating roof 20 and the inner peripheral surface 14a of the tank body 11 is always sealed, and the contained fluid 100 in the tank body 11 leaks. Can be surely prevented.

Further, the urging portion 32 is constituted by a counterweight 39 that swings according to the displacement of the sliding body 31 in the direction in which the urging portion 32 contacts and separates from the inner peripheral surface 14 a side of the tank main body 11. The bag 51A is brought into contact with the inner peripheral surface 14a of the tank body 11 according to the swinging.
In such a configuration, when the sliding body 31 is displaced in a direction in which the sliding body 31 contacts and separates from the inner peripheral surface 14a in the tank body 11 when an earthquake occurs, the counterweight 39 swings in conjunction with it. In the drive unit 55A, when the distance from the outer edge portion 21s of the floating roof 20 in the sliding body 31 exceeds the threshold value D in response to the swing of the counterweight 39, the bag 51A is placed on the inner peripheral surface of the tank body 11. 14a can be contacted.
Here, for example, when the displacement of the floating roof 20 is detected by an accelerometer or the like, it is difficult to specify at which part in the circumferential direction of the tank the sliding body 31 is separated from the inner peripheral surface 14a of the tank main body 11. It is. On the other hand, by using counterweights 39 provided at a plurality of locations in the circumferential direction, when the sliding body 31 is about to be separated from the inner peripheral surface 14a of the tank body 11, the counterweight 39 at that portion swings. Thus, the bag 51A can be brought into contact with the inner peripheral surface 14a of the tank body 11, and the space between the outer edge portion 21s of the floating roof 20 and the inner peripheral surface 14a of the tank body 11 can be sealed.

Further, when the drive unit 55A detects that the separation distance from the outer edge portion 21s of the floating roof 20 in the sliding body 31 exceeds the threshold D in response to the swing of the counterweight 39, the bag 51A is removed from the tank body 11. The switch 58 is provided in contact with the inner peripheral surface 14a.
With this configuration, when the switch 58 detects that the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds the threshold value D, the bag 51A is placed on the inner peripheral surface 14a of the tank body 11. Can be reliably contacted.

In addition, a secondary seal portion 50A is provided on the outer edge portion 21s of the floating roof 20, and is used to inflate the flexible bag 51A and the bag 51A to contact the inner peripheral surface 14a of the tank body 11. , A cylinder 52 containing a filler to be filled in the bag 51A, and an opening / closing valve 54A for intermittently supplying the filling body from the cylinder 52 to the bag 51A. The drive unit 55A opens the opening / closing valve 54A. The bag 51A is brought into contact with the inner peripheral surface 14a of the tank body 11.
With this configuration, when the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds the threshold value D, the drive unit 55A opens the on-off valve 54A. As a result, the bag 51A is filled with the filler from the cylinder 52, and the bag 51A is inflated to come into contact with the inner peripheral surface 14a of the tank body 11. Accordingly, the bag 51A functions as the bag 51A, and the space between the outer edge portion 21s of the floating roof 20 and the inner peripheral surface 14a of the tank body 11 can be sealed.

(Second Embodiment)
Next, a second embodiment of the storage tank according to the present invention will be described. Note that in the second embodiment described below, the same reference numerals are given to the same components as in the first embodiment, and description thereof will be omitted.
FIG. 5 is a plan view showing a configuration of a bag constituting the secondary seal portion in the storage tank according to the second embodiment.
As shown in FIG. 5, the storage tank 10 in this embodiment includes a seal portion 23 between the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11 and the outer edge portion 21 s of the floating roof body 21. . In this embodiment, the seal portion 23 includes a primary seal portion 30 (see FIG. 2) similar to that in the first embodiment, and a secondary seal portion 50B as described below.

  The secondary seal portion 50B includes a bag-like bag (seal member) 51B having flexibility such as rubber, and a cylinder 52 filled with a filler such as an inert gas such as nitrogen injected into the bag 51B. A connecting pipe 53 that connects the bag 51A and the cylinder 52, an on-off valve 54A (see FIG. 2) provided on the connecting pipe 53, and a drive unit 55A (see FIG. 2) that opens and closes the on-off valve 54A. Prepare.

  A plurality of the bags 51 </ b> B are arranged along the circumferential direction of the cylindrical wall 14 of the tank body 11, thereby forming an annular shape in plan view as a whole. Each bag 51B includes a cylinder 52, a connection pipe 53, an on-off valve 54A (see FIG. 2), and a drive unit 55A (see FIG. 2).

  In such a configuration, when the weight rod 39c contacts the switch 58 in any one of the drive units 55A provided with a plurality of sets and the switch 58 is switched, only the on-off valve 54A connected to the switch 58 is opened. . Thereby, among the bags 51B provided with a plurality of sets along the circumferential direction, only the bag 51B where the sliding body 31 is separated from the inner peripheral surface 14a of the cylindrical wall 14 is connected from the cylinder 52 via the connection pipe 53. The filling body is filled.

As shown in FIG. 4, the bag 51 </ b> B is inflated in this manner, so that the bag 51 </ b> B is formed on the tubular wall 14 of the tank body 11 at a portion where the sliding body 31 is separated from the inner peripheral surface 14 a of the tubular wall 14. It is in close contact with the inner peripheral surface 14a.
As a result, the sealing liquid L stays above the bag 51B, the suspension film 56, and the film body 37. Therefore, the closed state between the outer edge portion 21s of the floating roof main body 21 and the inner peripheral surface 14a of the cylindrical wall 14 of the tank main body 11 is maintained.

According to the storage tank 10 as described above, a plurality of bags 51B are provided along the circumferential direction of the tank body 11, and the drive unit 55A is provided in the sliding body 31 at at least a part of the tank body 11 in the circumferential direction. When the separation distance from the outer edge portion 21 s of the floating roof 20 exceeds the threshold value D, the bag 51 </ b> B provided at the portion exceeding the threshold value D is brought into contact with the inner peripheral surface 14 a of the tank body 11.
With this configuration, when the sliding body 31 is about to be separated from the inner peripheral surface 14a of the tank main body 11 at any part in the circumferential direction of the tank main body 11, the bag 51B is placed at that part. 11, the space between the outer edge portion 21s of the floating roof 20 and the inner peripheral surface 14a of the tank body 11 is quickly sealed.

Similarly to the first embodiment, when the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds a preset threshold D, the floating roof 20 is formed by the bag 51B of the secondary seal portion 50B. The outer edge 21s of the tank and the inner peripheral surface 14a of the tank body 11 are sealed, and the contained fluid 100 in the tank body 11 can be prevented from leaking.
The secondary seal portion 50B brings the bag 51B into contact with the inner peripheral surface 14a of the tank body 11 only when the distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds the threshold value D. Therefore, in normal times, the vertical movement of the floating roof 20 in the tank body 11 is not hindered by the frictional force in the secondary seal portion 50B.
Furthermore, since the secondary seal portion 50B is provided below the primary seal portion 30, even when the secondary seal portion 50B is additionally provided with respect to the existing storage tank 10, the primary seal portion 30B There is no need to provide the secondary seal portion 50 </ b> B with the floating roof 20.
As a result, it is possible to reliably prevent the contained fluid 100 from leaking from the gap between the floating roof 20 and the tank body 11 in the event of an earthquake, etc., while preventing the normal operation of the floating roof 20 from being disturbed. 10 can be easily installed.

  In this embodiment, a plurality of bags 51B are arranged along the circumferential direction of the cylindrical wall 14 of the tank body 11 so as to form an annular shape in plan view as a whole. Absent. Like the bag 51A shown in the first embodiment, it is composed of a tube having an annular shape in plan view that is continuous along the circumferential direction of the cylindrical wall 14 of the tank body 11, and the tubes are spaced in the circumferential direction. A plurality of partition walls provided may be divided into a plurality in the circumferential direction. As a result, a configuration substantially similar to that provided with the plurality of bags 51B in the circumferential direction as shown in the second embodiment can be realized.

  In the second embodiment, when the weight rod 39c contacts the switch 58 in any one of the drive units 55A provided with a plurality of sets, all the on-off valves 54A are opened and all the bags 51B are opened. You may make it expand | swell.

(Third embodiment)
Next, a third embodiment of the storage tank according to the present invention will be described. Note that in the third embodiment described below, the same reference numerals in the drawing denote the same components as those in the first and second embodiments, and a description thereof will be omitted.

FIG. 6 is a cross-sectional view illustrating a configuration of a seal portion in the storage tank according to the third embodiment. FIG. 7 shows the seal portion in the third embodiment when the floating roof body is displaced radially in the tank body due to an earthquake or the like, and the sliding body of the primary seal portion is separated from the inner peripheral surface of the tank body. It is sectional drawing which shows the state of a secondary seal part.
As shown in FIG. 6, the storage tank 10 in this embodiment includes a seal portion 23 between the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11 and the outer edge portion 21 s of the floating roof body 21. . In this embodiment, the seal portion 23 includes a primary seal portion 30 (see FIG. 2) similar to that of the first embodiment, and a secondary seal portion 50C as described below.

  The secondary seal portion 50C includes a bag-like bag 51A having flexibility such as rubber, a cylinder 52 filled with a filler such as an inert gas such as nitrogen injected into the bag 51A, and a bag 51A. A connection pipe 53 for connecting the cylinder 52, an on-off valve 54C (see FIG. 2) provided on the connection pipe 53, and a drive unit (seal member drive mechanism) 55C for opening and closing the on-off valve 54C are provided.

  In this embodiment, the open / close valve 54C is a mechanical valve whose open / close state is switched by a mechanical operation.

The drive unit 55 </ b> C includes a counterweight 39 and a drive cable 60.
One end of the drive cable 60 is connected to the weight rod 39c of the counterweight 39, and the other end is connected to the on-off valve 54C.

  A plurality of cylinders 52, connection pipes 53, on-off valves 54 </ b> C, and drive units 55 </ b> C are provided at intervals along the circumferential direction of the cylindrical wall 14 of the tank body 11.

  In such a secondary seal portion 50C, the bag 51A is normally not filled with a filler and is deflated, and is not in contact with the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11. Yes.

As shown in FIG. 7, due to an earthquake or the like, the floating roof body 21 is displaced in the radial direction in the tank body 11, and the outer edge portion 21 s of the floating roof body 21 is separated from the inner peripheral surface 14 a of the cylindrical wall 14. When displaced, the sliding body 31 urged by the weight member 39 d of the counterweight 39 of the urging portion 32 is displaced toward the inner peripheral surface 14 a side of the cylindrical wall 14.
When the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof body 21 exceeds a preset threshold value D, the drive portion 55C operates the opening / closing valve 54C via the drive cable 60 by the weight rod 39c of the counterweight 39. Then, the on-off valve 54C is switched from the closed state to the open state. Thereby, the filling body is filled from the cylinder 52 via the connection pipe 53, and the bag 51A is inflated.

  The inflated bag 51A is in close contact with the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11. At this time, the space between the bag 51A and the base plate 33 is closed by the suspension film 56. In addition, a closed state is maintained between the base plate 33 and the weight portion 22 of the outer edge portion 21 s of the floating roof body 21 by the film body 37 of the primary seal portion 30. Thereby, the sealing liquid L stays above the bag 51 </ b> A, the suspension film 56, and the film body 37.

  Thus, even if the floating roof body 21 is displaced by an earthquake or the like and the sliding body 31 of the primary seal portion 30 is separated from the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11, the outer edge portion of the floating roof body 21 The closed state between 21s and the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11 is maintained.

According to the storage tank 10 as described above, the drive unit 55 </ b> C causes the bag by the swinging operation of the counterweight 39 when the distance from the outer edge portion 21 s of the floating roof 20 in the sliding body 31 exceeds the threshold D. 51A is brought into contact with the inner peripheral surface 14a of the tank body 11. By configuring in this way, when the separation distance from the outer edge portion 21s of the floating roof 20 in the sliding body 31 exceeds the threshold D, the mechanical operation of the drive unit 55C by the swinging operation of the counterweight 39 allows The bag 51A can be reliably brought into contact with the inner peripheral surface 14a of the tank body 11.
In such a configuration, since it is not necessary to use electrical wiring or the like, the storage tank 10 does not need to have an explosion-proof specification, and the cost can be reduced.

Similarly to the first embodiment, when the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds a preset threshold value D, the floating roof is formed by the bag 51A of the secondary seal portion 50C. The space between the outer edge portion 21s of the 20 and the inner peripheral surface 14a of the tank main body 11 is sealed, and the contained fluid 100 in the tank main body 11 can be prevented from leaking.
The secondary seal portion 50 </ b> C brings the bag 51 </ b> A into contact with the inner peripheral surface 14 a of the tank body 11 only when the separation distance from the outer edge portion 21 s of the floating roof 20 in the sliding body 31 exceeds the threshold D. Therefore, in normal times, the vertical movement of the floating roof 20 in the tank body 11 is not hindered by the frictional force in the secondary seal portion 50C.
Furthermore, since the secondary seal portion 50C is provided below the primary seal portion 30, even when the secondary seal portion 50C is additionally provided with respect to the existing storage tank 10, the primary seal portion 30 There is no need to provide the secondary seal portion 50 </ b> C with the floating roof 20.
As a result, it is possible to reliably prevent the contained fluid 100 from leaking from the gap between the floating roof 20 and the tank body 11 in the event of an earthquake, etc., while preventing the normal operation of the floating roof 20 from being disturbed. 10 can be easily installed.

(Modification of the third embodiment)
Also in the third embodiment, instead of the bag 51A, as shown in the second embodiment, a plurality of bags 51B (see FIG. 4) are provided along the circumferential direction of the cylindrical wall 14 of the tank body 11. ) Are arranged, it is possible to adopt a configuration having an annular shape in plan view as a whole.

(Fourth embodiment)
Next, a fourth embodiment of the storage tank according to the present invention will be described. In addition, in 4th Embodiment demonstrated below, about the structure which is common in the said 1st-3rd embodiment, the same code | symbol is attached | subjected in a figure and the description is abbreviate | omitted.

FIG. 8 is a cross-sectional view illustrating a configuration of a seal portion in the storage tank according to the fourth embodiment. FIG. 9 is a cross-sectional view illustrating a state of the secondary seal portion when the sliding body of the primary seal portion is separated from the inner peripheral surface of the tank body in the seal portion according to the fourth embodiment.
As shown in FIG. 8, the storage tank 10 in this embodiment includes a seal portion 23 between the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11 and the outer edge portion 21 s of the floating roof body 21. . In this embodiment, the seal portion 23 includes a primary seal portion 30 similar to that in the first embodiment, and a secondary seal portion 50D as described below.

  The secondary seal portion 50 </ b> D is provided below the primary seal portion 30. The secondary seal portion 50D includes a holder 72 provided on the lower surface of the weight portion 22 via a support member 71, an elastic member 73 (seal member) provided in the holder 72, an urging member 74, and a stopper mechanism. (Stopper) 75D and a drive unit 76D for operating the stopper mechanism 75D are provided.

The support member 71 is continuous along the circumferential direction of the cylindrical wall 14 and is provided in an annular shape in plan view.
In the holder 72, an upper holder member 72a and a lower holder member 72b are arranged in parallel with a space in the vertical direction. The upper holder member 72a and the lower holder member 72b extend from the support member 71 outward in the radial direction of the cylindrical wall 14, and are continuous along the circumferential direction of the cylindrical wall 14, and are provided in an annular shape in plan view. It has been.

The elastic member 73 is made of an elastic material such as a rubber material or a silicone material. The elastic member 73 has a circular arc shape in plan view that continues for a certain length along the circumferential direction of the cylindrical wall 14. A plurality of such elastic members 73 are provided in the circumferential direction of the cylindrical wall 14, thereby forming an annular shape in plan view as a whole.
The elastic member 73 is provided between the upper holder member 72a and the lower holder member 72b of the holder 72, and is held so as to be movable in a direction in which the elastic member 73 is in contact with and away from the inner peripheral surface 14a of the cylindrical wall 14.

  The urging member 74 is made of, for example, a coil spring and urges the elastic member 73 toward the inner peripheral surface 14 a of the cylindrical wall 14. One or more urging members 74 are provided for one elastic member 73.

  The stopper mechanism 75 </ b> D restrains the elastic member 73 in a state accommodated in the holder 72. The stopper mechanism 75D is electrically operated by the drive unit 76D to release the restraint of the elastic member 73.

Similar to the drive unit 55A (see FIG. 2), the drive unit 76D includes a switch 58 provided on the weight unit 22, and a wiring 59 that electrically connects the switch 58 and the stopper mechanism 75D.
The switch 58 is disposed below the weight member 39 d of the counterweight 39 of the primary seal portion 30. When the weight rod 39c of the counterweight 39 swings and the weight member 39d descends and comes into contact with the switch 58, the switch 58 is switched between the ON state and the OFF state. The switch 58 outputs a predetermined electrical signal when switched between the ON state and the OFF state. The electrical signal output from the switch 58 is transmitted to the stopper mechanism 75D via the wiring 59. The stopper mechanism 75D releases the restraint of the elastic member 73 in accordance with the electrical signal transmitted from the switch 58.

  In such a secondary seal portion 50D, normally, the elastic member 73 is housed in the holder 72 and is not in contact with the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11.

  When the floating roof main body 21 is displaced in the radial direction in the tank main body 11 due to an earthquake or the like, the sliding body 31 that abuts against the inner peripheral surface 14 a of the cylindrical wall 14 of the tank main body 11 is moved to the cylindrical wall of the tank main body 11. 14 is displaced relative to the inner peripheral surface 14a. When the seismic intensity of the earthquake is huge, as shown in FIG. 9, the sliding body 31 may reach the limit of the moving stroke by the link mechanism 38 and may be separated from the inner peripheral surface 14 a of the cylindrical wall 14.

Prior to the drive unit 76D moving away from the inner peripheral surface 14a of the cylindrical wall 14 by reaching the limit of the moving stroke by the link mechanism 38, the drive unit 76D slides from the outer edge portion 21s of the floating roof body 21. When the separation distance exceeds a preset threshold value D, the weight rod 39c of the counterweight 39 comes into contact with the switch 58.
When the weight rod 39c comes into contact with the switch 58 and the switch 58 is switched, the restraint of the elastic member 73 by the stopper mechanism 75D is released, and the elastic member 73 is moved from the holder 72 to the cylindrical wall 14 by the urging force of the urging member 74. It protrudes in a direction approaching the inner peripheral surface 14a.
Here, a plurality of sets of drive units 76 </ b> D are provided at intervals along the circumferential direction of the cylindrical wall 14 of the tank body 11. When the switch 58 is switched in at least one of the plurality of sets of drive units 76D, the restraint of the elastic member 73 may be released by all the stopper mechanisms 75D, or the elastic member 73 at the portion where the switch 58 is switched. Only the restriction may be released.

  When the elastic member 73 protrudes, the elastic member 73 comes into close contact with the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11 even if the sliding body 31 is separated from the inner peripheral surface 14a of the cylindrical wall 14. At this time, the space between the elastic member 73 and the weight portion 22 is closed by the holder 72 and the support member 71. Thereby, the sealing liquid L stays above the elastic member 73, the holder 72, and the support member 71.

  In this way, even if the floating roof body 21 is displaced due to an earthquake or the like and the sliding body 31 of the primary seal portion 30 is separated from the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11, the elasticity of the secondary seal portion 50D. By projecting the member 73, the closed state between the outer edge portion 21s of the floating roof body 21 and the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11 is maintained.

  Further, after the earthquake or the like has subsided, the secondary seal portion 50D can be reused by returning the elastic member 73 into the holder 72 and restraining the movement of the elastic member 73 by the stopper mechanism 75D.

According to the storage tank 10 as described above, the secondary seal portion 50D is movable toward the inner peripheral surface 14a of the tank body 11 by the holder 72 provided on the outer edge portion 21s of the floating roof 20 and the holder 72. The elastic member 73 held on the inner surface 14a, the urging member 74 urging the elastic member 73 toward the inner peripheral surface 14a of the tank main body 11, and the movement of the elastic member 73 toward the inner peripheral surface 14a of the tank main body 11. And a stopper mechanism 75D for regulating, and the drive unit 76D brings the elastic member 73 into contact with the inner peripheral surface 14a of the tank body 11 by releasing the restriction of the movement of the elastic member 73 by the stopper mechanism 75D.
With this configuration, when the distance from the outer edge portion 21s of the floating roof 20 in the sliding body 31 exceeds the threshold value D, the drive unit 76D cancels the restriction of the movement of the elastic member 73 by the stopper mechanism 75D. To do. Then, the elastic member 73 urged by the urging member 74 moves toward the inner peripheral surface 14 a of the tank body 11. The elastic member 73 comes into contact with the inner peripheral surface 14 a of the tank body 11, so that the space between the outer edge portion 21 s of the floating roof 20 and the inner peripheral surface 14 a of the tank body 11 can be sealed.

Similarly to the first embodiment, when the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds a preset threshold value D, the elastic member 73 of the secondary seal portion 50D floats. The space between the outer edge portion 21s of the roof 20 and the inner peripheral surface 14a of the tank main body 11 is sealed, and the contained fluid 100 in the tank main body 11 can be prevented from leaking.
The secondary seal portion 50D brings the elastic member 73 into contact with the inner peripheral surface 14a of the tank body 11 only when the distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds the threshold value D. Therefore, in normal times, the vertical movement of the floating roof 20 in the tank body 11 is not hindered by the frictional force in the secondary seal portion 50D.
Further, since the secondary seal portion 50D is provided below the primary seal portion 30, even when the secondary seal portion 50D is additionally provided with respect to the existing storage tank 10, the primary seal portion 30 There is no need to provide the secondary seal portion 50 </ b> D with the floating roof 20.
As a result, it is possible to reliably prevent the contained fluid 100 from leaking from the gap between the floating roof 20 and the tank body 11 in the event of an earthquake, etc., while preventing the normal operation of the floating roof 20 from being disturbed. 10 can be easily installed.

(Fifth embodiment)
Next, a fifth embodiment of the storage tank according to the present invention will be described. Note that in the fifth embodiment described below, the same reference numerals in the drawing denote the same components as those in the first to fourth embodiments, and a description thereof will be omitted.

FIG. 10 is a cross-sectional view illustrating a configuration of a seal portion in the storage tank according to the fifth embodiment. FIG. 11 is a cross-sectional view showing a state of the secondary seal portion when the sliding body of the primary seal portion is separated from the inner peripheral surface of the tank body in the seal portion according to the fifth embodiment.
As shown in FIG. 10, the storage tank 10 in this embodiment includes a seal portion 23 between the inner peripheral surface 14 a of the cylindrical wall 14 of the tank body 11 and the outer edge portion 21 s of the floating roof body 21. . In this embodiment, the seal portion 23 includes a primary seal portion 30 (see FIG. 2) similar to that of the first embodiment, and a secondary seal portion 50E as described below.

  The secondary seal portion 50E includes a holder 72 provided on the lower surface of the weight portion 22 via a support member 71, an elastic member 73 (seal member) provided in the holder 72, an urging member 74, and a stopper mechanism. (Stopper) 75E and a drive unit 76E for operating the stopper mechanism 75E are provided.

The support member 71 is continuous along the circumferential direction of the cylindrical wall 14 and is provided in an annular shape in plan view.
In the holder 72, an upper holder member 72a and a lower holder member 72b are arranged in parallel with a space in the vertical direction. The upper holder member 72a and the lower holder member 72b extend from the support member 71 outward in the radial direction of the cylindrical wall 14, and are continuous along the circumferential direction of the cylindrical wall 14, and are provided in an annular shape in plan view. It has been.

The elastic member 73 is made of an elastic material such as a rubber material or a silicone material. The elastic member 73 has a circular arc shape in plan view that continues for a certain length along the circumferential direction of the cylindrical wall 14. A plurality of such elastic members 73 are provided in the circumferential direction of the cylindrical wall 14, thereby forming an annular shape in plan view as a whole.
The elastic member 73 is provided between the upper holder member 72a and the lower holder member 72b of the holder 72, and is held so as to be movable in a direction in which the elastic member 73 is in contact with and away from the inner peripheral surface 14a of the cylindrical wall 14.

  The urging member 74 is made of, for example, a coil spring and urges the elastic member 73 toward the inner peripheral surface 14 a of the cylindrical wall 14. One or more urging members 74 are provided for one elastic member 73.

  The stopper mechanism 75E restrains the elastic member 73 in a state accommodated in the holder 72. The stopper mechanism 75E releases the restraint of the elastic member 73 by being mechanically operated by the drive unit 76E.

The drive unit 76E includes a counterweight 39 and a drive cable 60.
One end of the drive cable 60 is connected to the weight rod 39c of the counterweight 39, and the other end is connected to the stopper mechanism 75E.

  In such a secondary seal portion 50E, the elastic member 73 is normally accommodated in the holder 72 and is not in contact with the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11.

  When the floating roof main body 21 is displaced in the radial direction in the tank main body 11 due to an earthquake or the like, the sliding body 31 that abuts against the inner peripheral surface 14 a of the cylindrical wall 14 of the tank main body 11 is moved to the cylindrical wall of the tank main body 11. 14 is displaced relative to the inner peripheral surface 14a. When the seismic intensity of the earthquake is huge, as shown in FIG. 11, the sliding body 31 may reach the limit of the moving stroke by the link mechanism 38 and be separated from the inner peripheral surface 14 a of the cylindrical wall 14.

The drive unit 76E is configured so that the sliding body 31 from the outer edge portion 21s of the floating roof main body 21 comes before the sliding body 31 reaches the limit of the moving stroke by the link mechanism 38 and is separated from the inner peripheral surface 14a of the cylindrical wall 14. When the separation distance exceeds a preset threshold value D, the weight rod 39c of the counterweight 39 operates the stopper mechanism 75E via the drive cable 60, and the restraint of the elastic member 73 by the stopper mechanism 75E is released. Then, due to the urging force of the urging member 74, the elastic member 73 protrudes from the holder 72 in a direction approaching the inner peripheral surface 14 a of the cylindrical wall 14.
Here, a plurality of sets of drive units 76 </ b> E are provided at intervals along the circumferential direction of the cylindrical wall 14 of the tank body 11. When the switch 58 is switched in at least one of the plurality of sets of drive units 76E, the restraint of the elastic member 73 may be released by all the stopper mechanisms 75E, or the elastic member 73 at the portion where the switch 58 is switched. Only the restriction may be released.

  When the elastic member 73 protrudes in this way, even if the sliding body 31 is separated from the inner peripheral surface 14a of the cylindrical wall 14, the elastic member 73 is in close contact with the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11. . At this time, the space between the elastic member 73 and the weight portion 22 is closed by the holder 72 and the support member 71. Thereby, the sealing liquid L stays above the elastic member 73, the holder 72, and the support member 71.

  Thus, even if the floating roof main body 21 is displaced due to an earthquake or the like and the sliding body 31 of the primary seal portion 30 is separated from the inner peripheral surface 14a of the cylindrical wall 14 of the tank main body 11, the elasticity of the secondary seal portion 50E. By projecting the member 73, the closed state between the outer edge portion 21s of the floating roof body 21 and the inner peripheral surface 14a of the cylindrical wall 14 of the tank body 11 is maintained.

According to the storage tank 10 as described above, the drive unit 76E is elastic by the swinging operation of the counterweight 39 when the distance from the outer edge portion 21s of the floating roof 20 in the sliding body 31 exceeds the threshold value D. The member 73 is brought into contact with the inner peripheral surface 14 a of the tank body 11.
By configuring in this way, when the separation distance from the outer edge portion 21s of the floating roof 20 in the sliding body 31 exceeds the threshold value D, by the mechanical operation of the drive unit 76E by the swinging operation of the counterweight 39, The elastic member 73 can be reliably brought into contact with the inner peripheral surface 14 a of the tank body 11.
In such a configuration, since it is not necessary to use electrical wiring or the like, the storage tank 10 does not need to have an explosion-proof specification, and the cost can be reduced.

Similarly to the first embodiment, when the separation distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds the preset threshold value D, the elastic member 73 of the secondary seal portion 50E lifts the floating body 21. The space between the outer edge portion 21s of the roof 20 and the inner peripheral surface 14a of the tank main body 11 is sealed, and the contained fluid 100 in the tank main body 11 can be prevented from leaking.
The secondary seal portion 50E brings the elastic member 73 into contact with the inner peripheral surface 14a of the tank body 11 only when the distance of the sliding body 31 from the outer edge portion 21s of the floating roof 20 exceeds the threshold value D. Therefore, in normal times, the vertical movement of the floating roof 20 in the tank body 11 is not hindered by the frictional force in the secondary seal portion 50E.
Further, since the secondary seal portion 50E is provided below the primary seal portion 30, even when the secondary seal portion 50E is additionally provided with respect to the existing storage tank 10, the primary seal portion 30E There is no need to provide the secondary seal portion 50 </ b> E between the floating roof 20.
As a result, it is possible to reliably prevent the contained fluid 100 from leaking from the gap between the floating roof 20 and the tank body 11 in the event of an earthquake, etc., while preventing the normal operation of the floating roof 20 from being disturbed. 10 can be easily installed.

(Other embodiments)
The storage tank of the present invention is not limited to the above-described embodiments described with reference to the drawings, and various modifications can be considered within the technical scope.
For example, in each of the above-described embodiments and the modifications thereof, the configuration using the seal liquid L and the sliding body 31 is employed as the primary seal portion 30, but any other configuration of the seal mechanism is employed for the primary seal portion 30. May be.

Furthermore, the structure of the floating roof 20 can be changed as appropriate.
Further, the entire configuration of the storage tank 10 may be any other configuration. For example, the tank body 11 is not limited to a cylindrical shape in a plan view and may be a polygonal shape in a plan view.
Furthermore, the storage fluid 100 stored in the storage tank 10 may be either gaseous or liquid, and there is no question regarding the type or application.
In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Storage tank 11 Tank main body 11S Storage space 13 Bottom board part 14 Cylindrical wall 14a Inner peripheral surface 15 Roof part 16 Piping 17 Lifting device 18 Ventilation tower 19 Gas diffusion pipe 20 Floating roof 21 Floating roof main body 21s Outer edge part 22 Weight part 22s Outer circumference Surface 23 Seal portion 27 Support column 28 Guide roller 30 Primary seal portion 31 Sliding body 32 Energizing portion 33 Base plate 35 Stay 36 Rod 37 Film body 38 Link mechanism 38a Bracket 38b Pin 38c Link plate 38d Pin 38e Link arm 38f Pin 39 Counterweight 39a Bracket 39b Pin 39c Weight rod 39d Weight member 39e Connecting wires 50A, 50B, 50C, 50D, 50E Secondary seal portions 51A, 51B Bag (seal member)
52 cylinder 53 connection piping 54A, 54C on-off valve 55A drive unit 55C drive unit (seal member drive mechanism)
56 Suspension film 57 Bracket 58 Switch 59 Wiring 60 Drive cable 71 Support member 72 Holder 72a Upper holder member 72b Lower holder member 73 Elastic member 74 Biasing member 75D, 75E Stopper mechanism (stopper)
76D, 76E Drive unit 100 Accommodating fluid (fluid)
D Threshold F Force G Ground L Seal liquid

Claims (7)

A tank body having a bottomed cylindrical shape extending in the vertical direction;
A floating roof covering the fluid stored in the tank body from above;
A sliding body disposed between an outer edge of the floating roof and an inner peripheral surface of the tank body, and slidable in a vertical direction with respect to the inner peripheral surface of the tank body; and A primary seal portion that has a biasing portion that biases toward the inner peripheral surface side of the tank body, and seals between the outer edge portion and the inner peripheral surface;
A seal member that is provided below the primary seal portion and seals between the outer edge portion and the inner peripheral surface by contacting the inner peripheral surface of the tank body; and the floating roof of the sliding body. A secondary seal part comprising a drive part for bringing the seal member into contact with the inner peripheral surface of the tank body only when the distance from the outer edge part exceeds a threshold;
A storage tank comprising: A plurality of the sealing members are provided along the circumferential direction of the tank body,
The drive unit is provided in a part that exceeds the threshold when a distance from the outer edge of the floating roof in the sliding body exceeds a threshold in at least a part of the tank body in the circumferential direction. The storage tank according to claim 1, wherein the seal member is brought into contact with the inner peripheral surface of the tank body. A plurality of the urging portions are provided along the circumferential direction of the tank body, and each of the urging portions is provided with a weight member at one end, and the sliding body is connected to the other end. Consists of a counterweight that swings according to the displacement of the sliding body in the direction of contact with and away from the inner peripheral surface side,
3. The storage tank according to claim 1, wherein the drive unit causes the seal member to contact the inner peripheral surface of the tank body in accordance with the swing of the counterweight. When the drive unit detects that the separation distance from the outer edge of the floating roof in the sliding body exceeds a threshold in response to the swing of the counterweight, the seal member is attached to the tank body. The storage tank of Claim 3 provided with the switch made to contact an internal peripheral surface. When the distance from the outer edge of the floating roof in the sliding body exceeds a threshold value, the driving unit moves the seal member in conjunction with the swinging operation of the counterweight in the inner periphery of the tank body. The storage tank of Claim 3 provided with the sealing member drive mechanism made to contact a surface. The secondary seal portion is
A bag as the sealing member provided at the outer edge of the floating roof, having flexibility and being hollow;
In order to inflate the bag and bring it into contact with the inner peripheral surface of the tank body, a cylinder containing a filler to be filled in the bag;
An on-off valve for intermittently supplying the filling body from the cylinder to the bag;
With
The driving unit is configured to fill the filling material to the bag by opening the on-off valve is inflated, according to any one of claims 1 to 5 in which Ru is brought into contact with the inner peripheral surface of the tank body Storage tank. The secondary seal portion includes a holder provided at the outer edge portion of the floating roof,
An elastic member as the seal member held movably toward the inner peripheral surface of the tank body on the holder;
A biasing member that biases the elastic member toward the inner peripheral surface of the tank body;
A stopper for restricting the movement of the elastic member toward the inner peripheral surface of the tank body,
The drive unit is stored according to any one of 5 the elastic member by releasing the restriction of movement of the elastic member by said stopper of claims 1 to Ru brought into contact with the inner peripheral surface of the tank body tank.

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